Good advice Cuppa.

This is all part of our preparation for the Lap and I am learning on the run.
I have 2 bottle holders on the trailer so 1 to each would be doable.
I am not even sure we will go with the solar water.

A local gas fitter quoted 450 - 500 to install. This may well be worth it to keep the insurers happy.
He said the bayonets are $150 each x 2, so his labour was cheap I guess.